JP2005232636A - Silk and chitosan-containing paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance antimicrobial properties and absorbing properties and improve strengths and cut ability of ultraviolet light and create utility values in a wide range in Japanese paper mechanically made into paper by using pulps such as linen or wood as raw materials. <P>SOLUTION: The subject paper is obtained by adding powdery and fibrous silk and a polymeric chitosan and a low-molecular chitosan to a pulp undiluted solution mixture in a process before paper making and then making the mixture into paper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

As a traditional Japanese papermaking technology base, it is versatile by adding silk, which is a raw material of silk fabric, and chitosan obtained by chemical treatment of crab shells as functional components to pulp such as hemp, wood and straw Functional paper manufacturing method and application that can be adapted to.

The raw materials for paper used to be mainly kouzo and mitsumata. However, with the widespread use of papermaking machinery, mass production has started using pulp such as hemp, wood, and straw, where raw materials can be obtained at low cost. It was. Paper is generally a material that is deeply connected to daily life because it is stronger, easier to use, and has a mental healing effect as a craft.
In recent years, functional composite materials have been developed by adding inorganic substances such as zeolite, low-level radioactive substances, and organic substances such as silk and tannin to this paper, and new ways of using it that are different from conventional paper applications have been devised. ing. With rapid changes in lifestyles and diversification of values, there is a need for paper that has been improved in functionality while retaining the characteristics of paper and adapted to new uses.

The following patents have been filed as functional paper based on paper. Manufacture of decorative paper with paper pulp mixed with breathable substances such as zeolite, paper surface and zeolite antibacterial agent uniformly dispersed in paper, tannin is applied and immersed in silk cloth or Japanese paper with silk There are papers that are dotted with silk pieces on paper made from the method, Kouzo, Mitsumata, etc., but patents relating to paper made by kneading using a raw material liquid containing silk and chitosan in the paper material and its manufacturing method Is not found so far.

Japanese paper with air permeability and water absorption Japanese Patent Application Laid-Open No. 9-224868 Patent application title: Freshness maintaining material for food preservation Japanese paper with silk

Much cheaper and easier to obtain than Kouzo and Mitsumata, paper made mainly of hemp pulp is given antibacterial properties, gentle touch to human skin, adhesion, and water retention, to make women's makeup and skin A paper that can be used as a wound dressing instead of a gauze when it is soiled and is slightly injured is produced. In addition, paper is more resistant to ultraviolet rays than Western paper, but cuts out ultraviolet rays to further weaken the effects of ultraviolet rays, making it difficult to discolor and producing paper that can be developed for new applications with excellent strength.

Chitosan and short fiber silk with different molecular weights made by dealkalizing chitin contained in crustacean shells such as crabs and shrimps in the pulp dissolution solution in the crushing process of cheap paper raw materials such as wood and hemp pulp Alternatively, short fiber silk and powdered silk are added together and stirred well to allow them to adhere to the pulp and stir the paper to evenly distribute the silk and chitosan in the Japanese paper.

By adding chitosan, antibacterial properties and infection-protecting action are imparted to the paper, and the tactile sensation, water retention, and adhesion to the skin due to moderate viscosity are improved. Addition of short fiber silk increases the strength of the paper and can be expected to prevent discoloration due to UV protection. The addition of powdery silk can be expected to improve the touch and further have the ability to decompose chemical substances. Therefore, it can be used as a paper for removing makeup and skin of women and as a wound dressing material in place of gauze when injured.

An aqueous solution in which a certain amount of hemp and wood pulp are agitated in water, and polymer chitosan and low-molecular chitosan, or polymer chitosan and low-molecular chitosan, respectively, together with fibrous silk and powder-like silk A paper manufacturing method in which silk and chitosan are uniformly distributed in pulp fibers using a papermaking machine.
High-molecular chitosan is negatively charged in water and exhibits an aggregating function. Low-molecular chitosan is water-soluble and has excellent adhesion, and powder silk also has adhesiveness.・ Silk adheres well to each pulp fiber, making it a paper with the desired ingredients and properties.

The mixing ratio of chitosan and silk is as follows. High molecular chitosan 8% to 16%, low molecular chitosan 0 to 16%, powder silk 4% to 8%, fibrous silk 8% to 16%. As the mixing ratio of chitosan increases, the raw material may adhere to the drying drum during the drying process.
It is necessary to adjust the blending amount of the low molecular chitosan.

Silk and chitosan were evenly distributed over the entire surface of the paper blended with the following raw material blends, confirming their functions. Note that the paper has the same color as ordinary paper made from hemp and wood pulp, but the surface has irregularities and the strength is weak. However, it has a large surface area per unit area and is excellent in adsorptivity and moisture absorption, so it is suitable for wiping off dirt.
Formulation Example 1

実施例１，２で得られた紙の両面を不織紙で覆い、サンドイッチ状態にした紙を作成すると、紙の表面は非常に滑らかであるため、皮膚の弱い箇所に付着した汚れを落としたり、皮膚に生じた僅かな創傷を被覆するのに適している。 In the paper mixed with the following raw material composition, silk and chitosan were uniformly distributed over the entire surface of the paper, almost the same as in Example 1, and the respective functions were confirmed. However, since it does not contain low-molecular chitosan that has a pasting action, the adhesion performance of silk to the valve is slightly inferior.
Formulation Example 2

When both sides of the paper obtained in Examples 1 and 2 are covered with non-woven paper to create a sandwiched paper, the surface of the paper is very smooth. Suitable for covering small wounds in the skin.

Antibacterial, adsorptive and soft to the skin, it is ideal for removing makeup from women. In addition, it can be used on a daily basis for oil removal such as fingers and palms. Since antibacterial and wound healing effects are recognized, it can be used as a covering material for mild scratches that occur on a daily basis as a substitute for gauze. Other uses as daily products are wide.

Production process of paper with silk and chitosan Cross-sectional enlarged view of paper with silk and chitosan

Explanation of symbols

1 Raw Material Mixing Tank 2 Silky Tosan Storage 3 Raw Material Scale 4 Stirring Device 5 Paper Making Device 6 Drying Device (Drum Type)
7 Paper 8 Silk piece 9 Silk powder
10 Chitosan

Claims (6)

In paper manufactured by machine-making using pulp such as hemp and wood, raw materials are mixed, silk and chitosan are added in the crushing process, and silk and chitosan are scattered in the mixed Japanese paper. Japanese paper characterized by that. As the silk to be added, paper in which short fiber silk and powder silk are mixed simultaneously or individually. Chitosan is a paper in which high molecular chitosan (molecular weight of 70,000 or more) and low molecular chitosan (molecular weight of 20,000 or less) are used simultaneously or individually. Use as a substitute for the gauze commonly used to wound-wrap paper containing silk and chitosan. Use Japanese paper with silk and chitosan as a makeup remover for women. Laminated paper in which nonwoven fabrics are pasted on both sides of Japanese paper with silk and chitosan.

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